Some problems from the Santa Barbara Sectional

All at IMPs, short matches

Both vul, you hold

AQ10x A7xx A109x Q

CHO

You

1

1

2

2

4

?

a) What now? What's your plan?
b) Do you play that 4 is ambiguous
about slam or suggests lack of slam interest
or neither? (Obviously, partner has few aces
this time, but in general, should he cue bid
if he's slammish, to cater to a slam try by
responder?)